diff --git a/grudge/symbolic/compiler.py b/grudge/symbolic/compiler.py
index f6e238083266d4ba0c510243b116b2e49b024631..c7bd6c2275a6d5adae756ca7c61b386a53d2b560 100644
--- a/grudge/symbolic/compiler.py
+++ b/grudge/symbolic/compiler.py
@@ -792,7 +792,7 @@ def aggregate_assignments(inf_mapper, instructions, result,
 # }}}
 
 
-# {{{
+# {{{ to-loopy mapper
 
 def set_once(d, k, v):
     try: